Irradiance

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Irradiance is a term in radiometry. It is defined as the change in flux over the change in area:

E = \frac{d\Phi}{dA}

Typical units are [\frac{W}{m^2}]. Irradiance typically varies as a function of wavelength.

The term "exitance" is used when talking about the irradiance leaving a surface. (E.g. the exitance from an area source).

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